>>For output try selecting the Windows GSWavetable synth (whatever you windows default is).
For some people this has fixed weird issues when DXi rerouting was in place for certain systems.

I've mostly had it as GSWavetable. Whatever I set it as, I get a warning about having DXi set, therefore MIDI output won't be used, except for MIDI thru. Which gives me an idea to search the help index for MIDI Thru. No joy there as the Help system crashes BiaB. But it gave me the thought of searching for MIDI Thru in the PDF and...it seems like I shouldn't need to do much more than add a "MIDI Thru" track.

So I add that and...nothin'. But I notice that its gray and the only tracks that sound are yellow. There's some kind of activation step I'm missing.